EP1056584B2 - Procede pour produire en continu, sans solvant ni mastication, des matieres autocollantes, a base d'elastomeres non thermoplastiques, et leur application pour produire des articles autocollants - Google Patents

Procede pour produire en continu, sans solvant ni mastication, des matieres autocollantes, a base d'elastomeres non thermoplastiques, et leur application pour produire des articles autocollants Download PDF

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Publication number
EP1056584B2
EP1056584B2 EP99906236A EP99906236A EP1056584B2 EP 1056584 B2 EP1056584 B2 EP 1056584B2 EP 99906236 A EP99906236 A EP 99906236A EP 99906236 A EP99906236 A EP 99906236A EP 1056584 B2 EP1056584 B2 EP 1056584B2
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European Patent Office
Prior art keywords
self
adhesive
coating
process according
adhesive composition
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EP99906236A
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German (de)
English (en)
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EP1056584B1 (fr
EP1056584A1 (fr
Inventor
Axel Burmeister
Sven Hansen
Frank Henke
Ralf Hirsch
Heiko Leydecker
Klaus Massow
Jochen Stähr
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Tesa SE
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Tesa SE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/24—Calendering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/10—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B29B7/426—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix with consecutive casings or screws, e.g. for charging, discharging, mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/485—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with three or more shafts provided with screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/487—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with consecutive casings or screws, e.g. for feeding, discharging, mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/84—Venting or degassing ; Removing liquids, e.g. by evaporating components
    • B29B7/845—Venting, degassing or removing evaporated components in devices with rotary stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/86—Component parts, details or accessories; Auxiliary operations for working at sub- or superatmospheric pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/154—Coating solid articles, i.e. non-hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/425—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders using three or more screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/435—Sub-screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/435—Sub-screws
    • B29C48/44—Planetary screws
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B05D1/265—Extrusion coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/72—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/823—Temperature control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives
    • B29B7/90—Fillers or reinforcements, e.g. fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2009/00—Use of rubber derived from conjugated dienes, as moulding material
    • B29K2009/06—SB polymers, i.e. butadiene-styrene polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2019/00—Use of rubber not provided for in a single one of main groups B29K2007/00 - B29K2011/00, as moulding material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2453/00—Presence of block copolymer

Definitions

  • the present invention relates to a process for the continuous, solvent- and mastication-free preparation of pressure-sensitive self-adhesives based on non-thermoplastic elastomers using tackifying resins, typical rubber softeners, optionally fillers and thermally activatable crosslinkers and their coating for the production of self-adhesive articles, in particular high-performance self-adhesive tapes.
  • Adhesion is referred to in technical terminology as instant tack and peel strength, and by definition describes the terms "pressure-sensitive adhesive”, “pressure-sensitive adhesive” and / or “pressure-sensitive adhesive tapes”; the permanent bonding under “light pressure” ("Pressure Sensitive Adhesives").
  • the second property of the pressure-sensitive adhesives according to the definition is their simple residue-free redetachability after use. This behavior is essentially determined by the high molecular weight rubber components as the elastomer component, which give the system as a cohesion (internal strength) the required strength under shear, which is particularly important for the use of the products at higher temperatures and / or mechanical stresses.
  • cohesion internal strength
  • reactive resin components or other chemical crosslinkers this property can be enhanced.
  • the performance of the pressure-sensitive adhesive is therefore essentially determined by the balanced ratio of adhesion and cohesion properties and by compatibility, homogeneity and stability of the mixing of mass constituents with extremely high and relatively low average molecular weights, which results in mass production in industry-standard mixing and kneading machines using solvents is relatively easy to achieve.
  • thermoplastic elastomers The solvent-free compounding and processing of self-adhesive has, however, prevailed essentially only for the processing of melting, so-called thermoplastic elastomers.
  • the mass production process is usually carried out in twin-screw extruders at higher temperatures in the melt, the coating is usually by means of slot dies.
  • thermoplastic elastomers consists essentially in the simplification of the coating process.
  • the absence of combustible solvents makes the dryer systems with their complex energy expenditure for the evaporation and recovery of solvents and the use of explosion-proof systems superfluous.
  • Hot melt coating systems are compact and allow significantly higher coating speeds. It is also an environmentally friendly technology that does not cause any solvent emissions
  • block copolymers with polystyrene block fractions are predominantly used according to the prior art.
  • the advantage of this class of substances is that the Polystyroldomänen located in the polymer soften above 100 ° C, the viscosity of the adhesive drops sharply and thus the ease of processing is given. After cooling to room temperature, the polystyrene domains reform and impart some shear strength to the pressure-sensitive adhesives based on thermoplastic elastomers.
  • thermoplastic elastomers can be properly compounded with adhesive hydrocarbon resins in the extruder process. In this way, a desired adhesive level can be achieved relatively easily. However, the resulting pressure-sensitive adhesives remain sensitive to temperatures above 40 ° C. Critical is this remaining "creep" for the self-adhesive tapes made on this basis for unlimited storage stability (rolling of the rolls in the stack especially when transporting to warmer climates) and for use at higher working temperatures (for example, as masking tapes in automotive finishing, where such tapes despite post-crosslinking lose their functionality by the pressure-sensitive adhesive softens and the shear strength for fixing the Abdeckmaskenpapiere is no longer guaranteed).
  • non-thermoplastic elastomers such as natural rubber
  • the required shear strengths can be achieved, but the solvent-free production and processing of natural rubber pressure-sensitive adhesives still presents the artisan unsolved problems.
  • mastication The targeted technical process of rubber degradation under the combined action of shear stress, temperature, atmospheric oxygen is referred to in the literature as mastication (English: mastication) and usually performed in the presence of chemical aids, which from the literature as Mastizierstoff or Peptizer, more rarely than "chemical plasticizers" are known.
  • chemical aids which from the literature as Mastizierstoff or Peptizer, more rarely than "chemical plasticizers” are known.
  • the mastication step is needed in rubber technology to facilitate the uptake of the additives.
  • the mastication is to be strictly differentiated from the degradation resulting in all common solvent-free polymer technologies such as compounding, conveying and coating in the melt, the degradation (English: Degradation).
  • Non-controlled degradation is often an undesirable phenomenon. This can be minimized by creating a protective gas atmosphere.
  • JP 07 324 182 A2 describes a multi-stage process in which a double-sided adhesive tape has a pressure-sensitive adhesive layer based on an acrylic resin adhesive and a second layer of a blend of isoprene-styrene elastomer, natural rubber and non-reactive hydrocarbon resin (Arkon P 100).
  • This tape serves as a carpet laying tape, where also no increased demands are made on the shear strength at higher temperatures.
  • non-thermoplastic elastomers are further described in JP 07 331 197 wherein an isocyanate-reactive natural rubber (polyisoprene grafted with maleic ester) having an average molecular weight below 1 million is used with aliphatic non-reactive hydrocarbon resins crosslinked with blocked isocyanates (for example Desmodur CT), the mixture being heated at 150 ° C for five minutes is pre-crosslinked for a long time and cured after subsequent spread on PET film at 180 ° C for several minutes (for example, 15 minutes).
  • This procedure makes it clear how costly post-crosslinking can be achieved if the natural rubber is subjected to excessive degradation during the production process.
  • the production process disclosed in each case is based on a twin-screw extruder which, in the case of the selected process control via mastication of the rubber and subsequent stepwise addition of the individual additives with a corresponding temperature control, enables compounding to give a homogeneous pressure-sensitive adhesive mixture.
  • This procedure makes the subsequent step of electron beam crosslinking (ESH) unavoidable, as well as the use of reactive substances as ESH promoters to achieve an effective crosslinking yield.
  • ESH electron beam crosslinking
  • Planetary roller extruders have been known for some time and were first used in the processing of thermoplastics such as PVC, where they were mainly used to feed the follower units such as calenders or rolling mills.
  • planetary roller extruders are available in various designs and sizes. Depending on the desired throughput, the diameters of the roll cylinders are typically between 70 mm and 400 mm.
  • Planetary roller extruders usually have a filling part and a compounding part.
  • the filling part consists of a screw conveyor, to which all solid components are continuously metered.
  • the screw conveyor then transfers the material to the compounding section.
  • the area of the filling part with the screw is preferably cooled in order to avoid caking of materials on the screw.
  • the compounding part consists of a driven central spindle and a plurality of planetary spindles, which rotate around the central spindle within a roll cylinder with internal helical toothing.
  • the speed of the central spindle and thus the rotational speed of the planetary spindles can be varied and is thus an important parameter for controlling the compounding process.
  • the materials are circulated between central and planetary spindles or between planetary spindles and helical gearing of the roller part, so that under the influence of shear energy and external temperature control, the dispersion of the materials to a homogeneous compound.
  • the number of rotating in each roller cylinder planetary spindles can be varied and thus adapted to the requirements of the process.
  • the number of spindles affects the free volume within the planetary roller extruder, the residence time of the material in the process and also determines the area size for the heat and material exchange.
  • the number of planetary spindles has on the introduced shear energy influence on the compounding result. With a constant roll diameter, a better homogenization and dispersing performance or a larger product throughput can be achieved with a larger number of spindles.
  • the maximum number of planetary spindles that can be installed between the central spindle and the roll cylinder depends on the diameter of the roll cylinder and the diameter of the planetary spindles used.
  • the roll cylinders can be equipped with a larger number of planetary spindles.
  • the object of the present invention was to provide a process with which, if appropriate using thermally reactive components, pressure-sensitive self-adhesive compositions based on non-thermoplastic elastomers can be produced continuously without solvent and, if appropriate, coated inline without the rubber being masticated in terms of property must become.
  • the invention relates to a method according to claim 1.
  • a planetary roller extruder is used as a continuously operating unit, the compounding part of which preferably consists of at least two, but more preferably three, coupled roller cylinders, wherein each roller cylinder may have one or more separate temperature control circuits.
  • the planetary roller extruder according to the process of the present invention does not damage the masticatory properties of the non-thermoplastic elastomers since they are not separately subjected to the influence of high shear energy but are always processed together with one or more liquid components.
  • These liquid components can be both plasticizers such as oils, but also resins that melt only during the compounding process with the application of shear energy and / or external tempering. The presence of these liquid components limits the amount of friction energy such that the mastication of the rubber, i. the molecular weight degradation of the elastomers, and high resulting compounding temperatures can be avoided.
  • planetary roller extruders have extremely large areas where it comes to material exchange and surface renewal, with which the frictional introduced shear energy can be dissipated quickly and in this way undesirably high product temperatures are avoided.
  • the filling part of the roll cylinder consists of a screw conveyor, to which all solid components are continuously metered.
  • the screw conveyor then transfers the material to the compounding section.
  • the area of the filling part with the screw is preferably cooled in order to avoid caking of materials on the screw.
  • the number of planetary spindles has an influence on the compounding result via the shear energy introduced: With a constant barrel diameter, a better homogenization and dispersing performance or a larger product throughput can be achieved with a larger number of spindles. According to the present invention preferably at least half, more preferably even at least 3 ⁇ 4 of the possible number of planetary spindles are used to achieve a good ratio of compounding grade to product ratio.
  • a planetary roller extruder whose compounding part is lengthened by interconnecting at least two roll cylinders.
  • the interconnection of preferably separately tempered roll cylinders enables a balanced temperature control of the process, which allows the use of thermally activatable crosslinker systems.
  • the roll cylinders While in the front compounding section of the planetary roller extruder, the roll cylinders are advantageously heated at temperatures above the melting point of the resins used, the rear compounding section is advantageously cooled to lower the product temperature. As a result, the residence time of the self-adhesive composition is kept as short as possible at higher temperatures, so that activation of the thermal crosslinker systems contained in the self-adhesive composition is avoided.
  • each roll cylinder can be equipped differently in terms of number and type of planetary spindles and so be adapted to the particular recipe and procedural requirements.
  • Thrust rings can have different free cross sections, whereby the back pressure of the product and thus the degree of filling or the amount of shear energy can be varied and adapted to the process requirements.
  • the thrust rings may be provided with radial bores through which liquids such as plasticizer oils or protective gases such as nitrogen, argon, carbon dioxide or the like. can be supplied to the compounding part of the planetary roller extruder.
  • the central spindle and each roll cylinder should preferably have one or more separate tempering or cooling circuits in order to allow a temperature regime that allows the use of thermally activatable crosslinking systems. In cases where this is not necessary, the temperature control circuits of interconnected roll cylinders can also be connected to one another in order to keep the number of temperature control devices as low as possible.
  • the filling part of the planetary roller extruder and the central spindle should preferably not be heated but cooled in order to avoid caking of material on the filling screw and to ensure effective heat exchange with the adhesive.
  • all solid components such as elastomers, fillers and additives, resins, anti-aging agents, etc. are metered together into the filling area of the planetary roller extruder.
  • These substances can be added both as separate components, as well as a common premix or as partial premixes the compounding.
  • the metering of the components as a premix is particularly suitable if the components have similar administration forms or similar bulk densities, so that the number of metering systems can be kept low in this way.
  • Premixes can be produced in a simple way, for example in powder mixers.
  • volumetric and gravimetric metering systems in common designs are suitable. It is also possible, the liquid components or even parts thereof, such as processing oil. to admit a premix.
  • the dosed materials are transported by the worm of the filling part into the first wafer locator of the planetary roller extruder.
  • liquid components such as plasticizer oils, soft resins or resin melts can be added via holes in the starting rings.
  • both the degree of degradation of the elastomers and the compounding temperature of the pressure-sensitive adhesive can be influenced.
  • a particularly low molecular weight degradation of the elastomers is obtained when a liquid plasticizer is already added, if there was no influence of friction energy, so this is either added to a solid premix, or the processing oil between the filling screw and the first roll cylinder is continuously added.
  • the process according to the invention allows the production of high-performance self-adhesive compositions and, in particular in combination with a downstream coating and crosslinking unit, the production of high-performance self-adhesive tapes while achieving special cost advantages.
  • a mass of the elastomers and the known additives required for the production of self-adhesive compositions such as fillers, aging inhibitors, plasticizers and tackifier resins in a planetary roller extruder solvent-free wherein the mass has a final temperature of less than 150 ° C, preferably less than 130 ° C, most preferably between 70 ° C and 110 ° C.
  • the total residence time of the mass in the planetary roller extruder should not exceed three minutes.
  • the resulting hot melt adhesive has a viscosity between 300 and 1500 Pa * s, in particular a viscosity between 800 and 1200 Pa * s at 130 ° C. and a shear rate of 100 rad / s.
  • the pressure-sensitive hotmelt adhesive produced according to the invention is coated with a coater on a web-shaped carrier in a solvent-free manner.
  • the degassing under the influence of vacuum is preferably carried out in screw machines, which at the same time can overcome the pressure losses of the piping and coating die.
  • single-screw extruders are particularly preferred, which also have a pressure control, so that the coating of the web-shaped carrier materials can be done with mass orders of very low fluctuation.
  • the coating takes place under the web-shaped carrier materials with the self-adhesive composition prepared by the process according to the invention.
  • Use of roll coating application units or multi-roll coating calenders which consist of preferably three, more preferably four coating rolls, the self-adhesive composition passing through one or more nips before being transferred to the web-like material is formed to the desired thickness.
  • This coating process is particularly preferred when the viscosities of the self-adhesive exceed values of 5000 Pa * s at a shear rate of 1 rad / s, because then a coating with extrusion nozzles no longer provides the required precision in the application of the dimensions.
  • the coating can be carried out in a synchronous or countercurrent process.
  • the coating is possible on roll coating applicators or multi-roll coating calenders at temperatures below 100 ° C, so that self-adhesives containing thermally activatable crosslinkers can also be coated.
  • a vacuum degassing for example a vacuum chamber, a vented extruder or the like may be installed between the planetary roller extruder and the applicator.
  • the crosslinking of the self-adhesive on the support by ionizing radiation such as electron beams, so that the resulting self-adhesive tape is shear-resistant and temperature stable.
  • ionizing radiation such as electron beams
  • UV rays can also be used for the crosslinking, in which case corresponding UV promoters must be added to the self-adhesive.
  • the heating of the pressure-sensitive hotmelt adhesive required for this purpose can take place with the aid of the known techniques, in particular with the aid of high-temperature channels, but also with the aid of infrared radiators or by means of high-frequency magnetic alternating fields, for example HF-UHF or microwaves.
  • the crosslinking of the pressure-sensitive hotmelt adhesive can furthermore be carried out by means of a combination of ionizing radiation and thermally activatable chemical crosslinkers.
  • the non-thermoplastic elastomer is selected from the group of natural rubbers or synthetic rubbers or it consists of any blend of natural rubbers and / or synthetic rubbers, wherein the natural rubber or natural rubbers in principle from all available qualities such as crepe, RSS, ADS, TSR or CV types, depending on the required level of purity and viscosity, and the synthetic rubber or synthetic rubbers from the group of random copolymerized styrene-butadiene rubbers (SBR), butadiene rubbers (BR), the synthetic polyisoprenes (IR), the butyl rubbers (IIR), the halogenated butyl rubbers (XIIR), the acrylate rubbers (ACM), the ethylene vinyl acetate copolymers (EVA) and the polyurethanes and / or their blends can be selected.
  • SBR random copolymerized styrene-butadiene rubbers
  • BR butadiene rubbers
  • IR synthetic polyisoprenes
  • thermoplastic elastomers having a weight fraction of 10 to 50% by weight, based on the total elastomer content, may be added to the non-thermoplastic elastomers.
  • SIS styrene-isoprene-styrene
  • SBS styrene-butadiene-styrene
  • Adhesive resins can be used. Mention may be made representative of the rosins, their disproportionated, hydrogenated, polymerized, esterified derivatives and salts. the aliphatic and aromatic hydrocarbon resins, terpene resins and terpene phenolic resins. Any combination of these and other resins can be used to tailor the properties of the resulting adhesive as desired.
  • the illustration of the state of knowledge in the "Handbook of Pressure Sensitive Adhesive Technology" by Donatas Satas (van Nostrand, 1989) is expressly noted.
  • plasticizers it is possible to use all softening substances known from adhesive tape technology. These include, among others, the paraffinic and naphthenic oils, (functionalized) oligomers such as oligobutadienes, isoprenes, liquid nitrile rubbers, liquid terpene resins, vegetable and animal oils and fats, phthalates, functionalized acrylates.
  • paraffinic and naphthenic oils such as oligobutadienes, isoprenes, liquid nitrile rubbers, liquid terpene resins, vegetable and animal oils and fats, phthalates, functionalized acrylates.
  • thermally activatable chemical crosslinkers such as accelerated sulfur or sulfur donor systems, isocyanate systems, reactive melamine, formaldehyde and (optionally halogenated) phenol-formaldehyde resins or reactive phenolic resin or diisocyanate crosslinking systems with the corresponding Activators, epoxidized polyester and acrylate resins and their combinations can be used.
  • the crosslinkers are preferably activated at temperatures above 50 ° C, in particular at temperatures of 100 ° C to 160 ° C, most preferably at temperatures of 110 ° C to 140 ° C.
  • the thermal excitation of the crosslinkers can also be done by IR rays or high-energy alternating fields.
  • a self-adhesive tape can be produced with the aid of the pressure-sensitive pressure-sensitive hotmelt adhesive by applying the self-adhesive composition to a sheet-like material at least on one side.
  • all known supports if appropriate with appropriate chemical or physical surface pretreatment of the coating side and antiadhesive physical treatment or coating of the reverse side, are suitable as web-shaped carrier materials for the self-adhesives prepared and processed according to the invention.
  • examples include creped and uncreped papers.
  • Polyethylene Polypropylene mono- or biaxially oriented polypropylene films, polyester, PVC and other films, sheet-like foams, for example of polyethylene and polyurethane, woven, knitted and nonwoven fabrics.
  • the web-like material can be a double-sided anti-adhesive coated material such as release papers or release films.
  • the thickness of the self-adhesive on the web-shaped material can be between 10 .mu.m and 2000 .mu.m, preferably between 15 .mu.m and 150 .mu.m.
  • the self-adhesive may be applied in a thickness of 800 ⁇ m to 1200 ⁇ m on a release paper.
  • Such an adhesive layer is versatile, especially after crosslinking, as a carrierless double-sided self-adhesive tape.
  • the method according to the invention makes it possible for the first time to be able to completely dispense with crosslinking of the pressure-sensitive adhesive or to effect effective crosslinking which, for example, permits high-temperature applications of the adhesive tapes produced by this process via high-energy radiation can, without promoters are required.
  • the use of thermally activable crosslinkers in the production of solvent-free self-adhesive compositions based on non-thermoplastic elastomers is now also possible for the first time by the temperature control at a low level.
  • the self-adhesives prepared by the process according to the invention are of high shear strength.
  • the rubbers used are not subjected to mastication, however, degradation processes occur in the individual process steps which, however, do not permanently impair the properties of the self-adhesive composition. In addition, these processes are restricted and manageable by the method according to the invention.
  • the bond strength (peel strength) of the compositions was determined according to AFERA 4001.
  • the shear strength of the adhesives tested was determined according to PSTC 7 (Holding Power). All values given were determined at room temperature and the stated loads of 10 or 20 N, with a bond area of 20 ⁇ 13 mm 2 . The results are given in minutes of holding time.
  • a planetary roller extruder from ENTEX Rust & Mitschke was used.
  • the diameter of a roll cylinder was 70 mm, its process length has been varied between 400 mm and 1200 mm.
  • One of the planetary roller extruder configurations as used in the examples below FIG. 1 is a planetary roller extruder from ENTEX Rust & Mitschke.
  • the planetary roller extruder has a filling part (2) and a compounding part (5), which consisted of three roll cylinders (5a-5c) connected in series.
  • the planetary spindles (7) driven by the rotation of the central spindle (6) exchange the materials between central spindle (6) and planetary spindles (7) or between planetary spindles (7) and the wall of the roll cylinder (5a-5c).
  • the speed of the central spindle (6) could be infinitely adjusted up to 110 revolutions per minute.
  • each roll cylinder (5a-5c) At the end of each roll cylinder (5a-5c) is a thrust ring (8) which holds the planetary spindles (7) stationary.
  • the inside hollow screw conveyor (3) and central spindle (6) are non-positively connected with each other and have a common tempering.
  • Each roll cylinder (5a-5c) of the compounding part (5) had two separate tempering circuits.
  • the filling part (2) was cooled by means of a further temperature control circuit. Pressurized water was used as the tempering medium, the cooling was carried out with cooling water of 15 ° C to 18 ° C.
  • the temperature of the self-adhesive composition was determined by means of a penetration probe in the product outlet (9).
  • FIG. 2 comes the strand (11) of the self-adhesive from the upstream planetary roller extruder, in a conveying extruder (12).
  • the self-adhesive composition is freed of air via an opening (16) with the aid of vacuum and conveyed into a coating nozzle with a clothes hanger distribution channel (13), with which the self-adhesive composition is applied to the carrier material (15) running over a cooling roller (14).
  • FIG. 3 finally provides an overview of the entire process in a particularly advantageous embodiment.
  • the compounding of the self-adhesive composition (28) takes place in a planetary roller extruder (21).
  • the finished self-adhesive composition (28) is conveyed into a melt pump (22), which transfers the self-adhesive composition (28) into a roll applicator.
  • a degassing extruder (23) is located between the melt pump (22) and the roller applicator for the purpose of achieving a bubble-free self-adhesive (28).
  • the roller applicator is formed by a metering roller (24), a doctor roller (25), which determines the thickness of the self-adhesive layer (28) on the carrier material (29) and a transfer roller (26). Finally, the self-adhesive composition (28) and the carrier material (29) are brought together on a lay-up roll (27) and thus form a laminate (30).
  • Example recipe A A component Weight fraction [phr] NR Air Dried Sheets 100 Zinc oxide, active 11.4 Escorez 1202® 43.6 Dercolyte S115® 20 Resin 731 D ® 50.9 Ondina G 33® 8th Lowinox AH 25® 2.5 total 236.4
  • a premix was prepared in a 50 kg powder mixer, which was metered via a volumetric dosing into the filling part of the planetary roller extruder.
  • the temperature control circuits for the central spindle and the filling part (TK1 and TK2) were water-cooled, each roller part was heated at 100 ° C.
  • the table shows the maximum product rates depending on the number of roller cylinders. Comparative example Number of roll cylinders Q max [kg / h] 1 1 45 2 2 62 3 3 83
  • the recipe A from Examples 1-3 The composition was prepared analogously to Example 3 in a planetary roller extruder.
  • the mass exit temperature was 112 ° C.
  • the resulting adhesive was applied immediately after the manufacturing process to a creped, impregnated by industry standard processes, equipped with known release and primer layer paper support, which has a basis weight of 68 g / m 2 , applied with a layer thickness of 40 microns.
  • the coating of the adhesive was carried out with the aid of a 4-Walzenkalanderettesswerkes Fa. Farrel in a working width of 1200 mm with mass feed through a single-screw extruder.
  • the coating was carried out in synchronism. ie with the aid of a web-laying feed roll (rubber) the adhesive application was transferred from the third order-determining calender roll to the creped paper.
  • the emerging from a feed extruder adhesive was conveyed by means of a conveyor belt iridescent in the upper nip of the calender.
  • the pre-set gap between the two upper rollers of the calender achieves a mass pre-metering which produces an approximately 2 to 3 cm thick adhesive film.
  • This preformed mass film is removed by the third roller and formed by the gap set to the third roll to the desired mass application.
  • the third roller transfers at web speed in synchronism to the guided over a contact roller substrate.
  • the adhesive tape thus obtained has a bond strength of 3.5 N / cm, shearing life times (10N) of> 1000 min, and suitability as a masking tape with short-term thermal stability up to 80 ° C.
  • the adhesive applied to the adhesive tape thus obtained was crosslinked by electron beams after the coating.
  • the irradiation was carried out on a scanning accelerator from POLYMER PHYSIK Tübingen at an acceleration voltage of 175 kV and a radiation dose of 20 kGy.
  • Example recipe B B component Weight fraction [phr] NR Air Dried Sheets 100 Zinc oxide, active 11.4 stearic acid 1.1 Escorez 1202® 20 Dercolyte S115® 43.6 Resin 731 D ® 50.9 Ondina G 33® 8th Lowinox AH 25® 2.5 Rhenogran S 80® 3.1 Rhenogran ZEPC 80® 4.4 Rhenocure HX® 0.5 total 245.5
  • the mass production was carried out in a planetary roller extruder according to FIG. 1 with three roller cylinders.
  • the first roll cylinder was equipped with six, the second and third Waetationsylinder each with seven planetary spindles.
  • the central spindle speed was 110 rpm.
  • the temperature control circuits 1 to 3 and 7 to 8 were operated with cooling water of 18 ° C, the temperature control circuits 4 to 6 were heated at 95 ° C.
  • the mass outlet temperature was determined to be 99.degree.
  • the adhesive thus obtained was applied immediately after Herstellprozeßauf a ffengekreppten impregnated according to standard industry procedures, equipped with known release and primer layers of paper support which had a basis weight of 85 g / m 2 with a layer thickness of 55 microns.
  • the coating of the adhesive analogously to Example 4 in a working width of 500 mm. All rolls were tempered to 113 ° C. The coating speed was 60 m / min.
  • the adhesive applied to the adhesive tape thus obtained was crosslinked after the coating by electron beams according to Example 4.
  • the radiation dose was 25 kGy.
  • the adhesive tape thus obtained had an adhesive force of 4.5-5 N / cm, shearing life (10N) of greater than 10,000, and a suitability as cover tape with short-term thermal stability up to 140 ° C.
  • the adhesive of the adhesive tape produced according to Example 5 was not chemically crosslinked with electron beams but under the influence of temperature.
  • the crosslinking took place in a vulcanization channel with an effective residence time of 4 min / 120 ° C.
  • the temperature resistance of the strip thus obtained increased to 160 ° C.
  • Example recipe C C component Weight fraction [phr] SMR L 100 Dercolyte S 115 ® 104 ASM Lowinox AH 25® 2 total 206
  • Example 4 The above-mentioned components were fed continuously via volumetric metering systems continuously to the filling part of the planetary roller extruder.
  • the process parameters were otherwise similar to Example 4.
  • the product exit temperature was measured to be 122 ° C.
  • the adhesive obtained in this way was applied immediately after the production process to an industry-standard 30 .mu.m thick BOPP film, which is provided with an industry-standard isocyanate-based primer layer and an industry-standard carbamate-based release layer, with a layer thickness of 20 .mu.m.
  • the adhesive mass exiting a feed extruder was coated using a rigid 2-roll applicator.
  • the coating of the adhesive film on the primed side of the film was carried out directly.
  • a coating gap was set in accordance with the application thickness.
  • the first roll was tempered to 100 ° C, the web-leading roll at 90 ° C.
  • the adhesive emerging from the conveying extruder had a temperature of 120.degree.
  • the coating was carried out at 50 m / min.
  • the adhesive tapes thus obtained have an adhesive force of 3-4 N / cm, and shearing life times (20N) of> 10 000 min, they are suitable as adhesive tapes for packaging purposes.
  • Example recipe D D component Weight fraction [phr] Rubber ADS 100 Dercolyte S 115 ® 104 Sunpar Oil 2280® 2 ASM Lowinox AH 25® 2 total 208
  • Example 7 The mass production was carried out analogously to Example 7.
  • the liquid plasticizer was added continuously via the injection ring in front of the first roll cylinder with the aid of a membrane piston pump.
  • the product exit temperature was measured at 105 ° C.
  • the product rate was 68 kg / h.
  • the adhesive thus obtained was applied immediately after the manufacturing process on both sides of a commercial, 38 micron thick E-PVC film with a layer thickness of 2 ⁇ 40 microns.
  • the coating was carried out with the aid of the commissioned work from Example 5.
  • the adhesive was applied indirectly in the opposite direction to the E-PVC film.
  • the coating was carried out at a speed of 50 m / min.
  • the transfer roller was operated at 85% of the web speed.
  • Roller 1 and roller 2 were tempered at 100 ° C and 80 ° C, respectively.
  • the web-guiding roller was tempered to 30 ° C.
  • the adhesive side was covered with a double-sided silicone paper. The composite was then coated and rolled up by the same procedure as the first side.
  • the tapes thus obtained have a bond strength of 7.5 N / cm, and shearing life (10N) of> 5 000 min, they are suitable as double-sided adhesive tapes for a variety of purposes, such as for the cliché adhesive bonding in the printing industry.
  • Example recipe E For the production of a double-sided carpet laying tape based on fabric carrier, the following example recipe E was used.
  • Example recipe E e component Weight fraction [phr] SMR L 100 Escorez 1202® 55 Dercolyte S 135® 55 Wingtack 10® 15 Zinc oxide resin seal ® 22 ASM Lowinox AH 25® 2 total 247
  • the mass production was carried out with a planetary roller extruder configuration as mentioned in Example 5, at a central spindle speed of 95 rpm.
  • the thrust rings after the first and second roll cylinders were provided with radial bores for the purpose of liquid metering.
  • the free cross sections in the starting rings were 46 and 44 mm in this example.
  • the roll cylinders were heated via the temperature control circuits 4 to 6 at 105 ° C, the temperature control circuits 1 to 3 and 7 to 8 were cooled with water, which had a temperature of 15 ° C.
  • the dosage of the formulation components was done with the exception of Escorez and Dercolyte resins via separate volumetric dosing. Of the two resins, premix was prepared in advance in the powder mixer, which was then added. The viscous soft resin Wingtack 10 was preheated to 60 ° C for ease of dosing and metered via a pipe with electrical heat tracing in the injection ring in front of the first roll cylinder. As a metering pump, a double-acting piston metering pump was used, the Vorratsbenzoiter had a heated and thermally insulated double jacket, which was heated to 60 ° C. The product exit temperature was measured at 109 ° C. The product rate was 65 kg / h.
  • the adhesive thus obtained was applied immediately after the manufacturing process on both sides of a commercial cellulosic tissue (thread density 19/17) with a layer thickness of 2 x 120 microns.
  • the production of a double-sided carpet laying tape on fabric carrier base was carried out with the aid of the transfer coating.
  • a release paper siliconized on both sides was coated directly with 120 ⁇ m by the method of Example 4.
  • About a laminating the commercial Zellwollrohgewebe was laminated and coated the composite in a second operation on the open side also directly with 120 microns adhesive.
  • the temperature of the adhesive was 103 ° C.
  • the coating rollers were heated to 90 ° C.
  • the Zellwollrohgewebe was fed via a heated laminating station, wherein the first laminating roller had a siliconized surface coating and the web-guiding second laminating roller was heated to 80 ° C.
  • the coating was carried out at a speed of 30 m / min.
  • the adhesive tapes obtained in this way have an adhesive force of> 7 N / cm, and shearing life times (10N) of greater than 200 minutes; they are suitable as double-sided adhesive tapes for a wide variety of purposes, in particular for carpet laying work.
  • Example recipe F F component Weight fraction [phr] SMR L 70 Cariflex IR 305® 30 Escorez 1202® 55 Picco 5120® 55 Wingtack 10® 50 Sunpar Oil 2280® 15 ZnO resin seal ® 50 ASM Butyl Zimate® 2 total 325
  • the two powdered components and the two elastomers each premixes were prepared, which were added via volumetric dosing separately in the filling part of the planetary roller extruder.
  • the process oil was added by means of a membrane piston pump via the injection ring in front of the first roll cylinder, the soft resin preheated to 60 ° C. via the contact ring after the first roll cylinder by means of a double-acting piston metering pump.
  • the dosage of all components was carried out so that a product rate of 62 kg / h was obtained.
  • the product exit temperature was measured at 105 ° C.
  • the adhesive thus obtained was applied to a polyester / cotton blended fabric having a yarn density of 22/10 with an 80 ⁇ m polyethylene layer. which is equipped on the back with an industry-standard carbamate release varnish, applied with a layer thickness of 120 microns.
  • the production of all-purpose fabric tapes was carried out according to the method of Example 4. Instead of the paper carrier web, the polyester / cotton blended fabric and the polyethylene film were passed over the applicator roll and coated on the polyester / cotton blended fabric over the roll coating calender shaped 120 micron thick adhesive layer. The coating was carried out at 155 m / min in a working width of 1200 mm. The coating rolls were operated in a ratio of 6: 1. The tape thus produced has a bond strength of> 5 N / cm, and is suitable as a general-purpose adhesive tape for a variety of purposes.
  • Example recipe G component Weight fraction [phr] SMR L 100 stearic acid 1.1 Escorez 1202® 55 Dercolyte S 135 ® 55 Wingtack 10® 15 Zinc oxide active ® 22 ASM Lowinox AH 25® 2 Rhenogran S 80® 4.4 Rhenogran ZEPC 80® 4.4 Rhenocure HX® 0.6 total 259.5
  • the mass production was carried out in a planetary roller extruder according to FIG. 1 with three roll cylinders and an assembly on planetary spindles as in example 5.
  • the speed of the central spindle was set to 100 rpm.
  • the temperature control circuits 1 to 3 and 7 to 8 were operated with cooling water of 16 ° C, while the temperature control circuits were heated 4 to 5 at 110 ° C and the temperature control 6 at 95 ° C. With this temperature regime, a mass outlet temperature of 98 ° C was obtained.
  • the resulting adhesive was applied immediately after the manufacturing process to a conventional release paper with release coating on both sides, with a layer thickness of 1000 microns.
  • the release paper which was siliconized on both sides, was directly coated with 1000 ⁇ m using the method of Example PACK. The coating was carried out at a speed of 30 m / min.
  • crosslinking was carried out in a vulcanization channel with an effective residence time of 4 min / 80 ° C.
  • the coated release paper thus obtained constitutes a versatile double-sided adhesive tape. It can be used, for example, as a mounting aid, for the self-adhesive finishing of parts or profiles, and for the transfer of the adhesive layer to other substrates.
  • Example recipe H H component Weight fraction [phr] Rubber ADS 100.0 Hercurez C. 54.9 Escorez 1202 41.4 Plasticizer Nipol 17.5 Zinc oxide active 7.5 Silitin Z 86 24.7 stearic acid 1.0 ASM Lowinox AH 25 2.5 total 249.5
  • the preparation of the self-adhesive took place in a planetary roller extruder according to FIG. 1 with three roll cylinders and an assembly of planetary spindles as mentioned in Example 5.
  • the planetary roller extruder was operated at a central spindle speed of 110 rpm.
  • the temperature control circuits 1 to 3 and Temperier Vietnamese 8 were operated with cooling water of 16 ° C.
  • the temperature control circuits 4 to 5 were heated at 120 ° C and the temperature control circuits 6 to 7 at 100 ° C. In this case, a melt temperature at the outlet of the planetary roller extruder of 112 ° C was obtained.
  • Example 11 Analogously to Example 11, all solid components were premixed to a meterable premix, which was metered into the filling opening of the planetary roller extruder.
  • the viscous Plasticizer Nipol was preheated to 75 ° C for ease of dosing and added via the thrust ring before the second roll cylinder with the aid of the double-acting piston metering pump of Example 9.
  • the set product rate was 81 kg / h.
  • the adhesive was / m applied by means of transfer coating both sides of a commercially available foam based on polyethylene having a thickness of 1000 microns and a density of 95 kg 3 with a layer thickness of 2 x 55 g / m 2.
  • a release paper siliconized on both sides was coated directly with 55 ⁇ m by the method of Example 8.
  • the PE foam is laminated and coated in a second operation on the open side also directly with 55 micron adhesive application.
  • the temperature of the adhesive was 100 ° C.
  • the coating rollers were heated to 90 ° C.
  • the PE foam was fed via a heated laminating station, wherein the first laminating roller had a siliconized surface coating and the web-guiding second laminating roller was heated to 80 ° C.
  • the coating was carried out at a speed of 30 m / min.
  • the adhesive tapes obtained in this way have an adhesive force of> 3.5 N / cm, and shearing life times (10N) of> 250 minutes; they are suitable as double-sided adhesive tapes with tolerance-compensating and damping properties for a very wide variety of purposes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Procédé pour produire en continu, sans solvant ni mastication, des matières autocollantes, à base d'élastomères non thermoplastiques, dans une unité fonctionnant en continu et comportant une partie de remplissage et une partie de mélangeage. Ce procédé consiste à a) introduire les composants solides de la matière autocollante, tels que les élastomères et les résines, dans la partie de remplissage de l'unité, et éventuellement introduire des charges, colorants et/ou réticulants; b) transférer les composants solides de la matière autocollante, de la partie de remplissage à la partie de mélangeage; c) ajouter les composants liquides de la matière autocollante, tels que les plastifiants, réticulants et/ou autres résines donnant du collant, dans la partie de mélangeage; e) produire une matière autocollante homogène dans la partie de mélangeage; e) retirer la matière autocollante.

Claims (12)

  1. Procédé pour la préparation continue, sans solvant ni mastication, de masses autoadhésives (14) à base d'élastomères non thermoplastiques dans un appareil fonctionnant en continu avec une partie de remplissage (2) et une partie de compoundage (5), l'appareil étant une extrudeuse à cylindres planétaires (21), dont la partie de compoundage (5) est de préférence constituée par au moins deux, de manière particulièrement préférée cependant par trois cylindres de laminage couplés (5a-5c), constitué par
    a) introduction des composants solides de la masse autoadhésive (14) tels que des élastomères et des résines dans la partie de remplissage (2) de l'appareil,
    le cas échéant introduction de charges, colorants et/ou réticulants,
    b) transfert des composants solides de la masse autoadhésive (14) de la partie de remplissage (2) dans la partie de compoundage (5),
    c) addition des composants liquides de la masse autoadhésive (14) tels que les plastifiants, les réticulants et/ou d'autres résines rendant adhésif dans la partie de compoundage (5),
    d) préparation d'une masse autoadhésive homogène (14) dans la partie de compoundage (5) et
    e) évacuation de la masse autoadhésive (14), où la masse autoadhésive (14) est revêtue sur un matériau en forme de bande (15) et le revêtement du matériau en forme de bande (15) est réalisé avec un laminoir ou une calandreuse (24, 25, 26, 27), la masse autoadhésive (14) étant façonnée à l'épaisseur souhaitée lors du passage dans une ou plusieurs fentes de laminage avant le transfert sur le matériau en forme de bande (15).
  2. Procédé selon la revendication 1, caractérisé en ce que chaque cylindre de laminage (5a-5c) de l'extrudeuse à cylindres planétaires (21) contient au moins la moitié, de préférence plus de ¾ du nombre possible d'axes planétaires (7).
  3. Procédé selon les revendications 1 ou 2, caractérisé en ce que la masse autoadhésive (14) est libérée des bulles de gaz après l'évacuation de l'appareil sous l'influence du vide.
  4. Procédé selon la revendication 1, caractérisé en ce qu'entre l'appareil et le dispositif de revêtement est disposée une pompe à masse fondue ou une extrudeuse pour le transport de la masse adhésive, en particulier une extrudeuse de dégazage (23), qui est exploitée avec une régulation de la vitesse de rotation ou de la pression, de préférence de la pression.
  5. Procédé selon les revendications 1 à 4, caractérisé en ce que le matériau revêtu (30) est réticulé dans une étape consécutive au revêtement.
  6. Procédé selon la revendication 5, caractérisé en ce que le matériau revêtu (30) est réticulé sans promoteurs au moyen de rayons électroniques.
  7. Procédé selon la revendication 5, caractérisé en ce que le matériau revêtu (30) est réticulé thermiquement.
  8. Procédé selon les revendications 1 à 7, caractérisé en ce que la masse autoadhésive (14) présente, à la sortie de l'appareil, une température inférieure à 150°C, de préférence inférieure à 130°C, de manière particulièrement préférée entre 70°C et 110°C.
  9. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que les élastomères non thermoplastiques sont choisis dans le groupe des caoutchoucs naturels, des caoutchoucs de styrène-butadiène copolymérisés statistiquement (SBR), des caoutchoucs de butadiène (BR), des polyisoprènes synthétiques (IR), des caoutchoucs de butyle (IIR), des caoutchoucs de butyle halogénés (XIIR), des caoutchoucs d'acrylate (ACM), des copolymères d'éthylène-acétate de vinyle (EVA), des polyoléfines et des polyuréthanes et/ou de leurs mélanges.
  10. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'on ajoute aux élastomères non thermoplastiques des élastomères thermoplastiques présentant une proportion pondérale de 10 à 50% en poids.
  11. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que les réticulants sont choisis dans le groupe des systèmes de réticulation à base de soufre, des systèmes de réticulation accélérés à base de soufre, des systèmes de réticulation à base de résine phénolique réactive ou des systèmes de réticulation à base de diisocyanate.
  12. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que les réticulants sont activables par voie thermique et de préférence activés à des températures supérieures à 50°C, de préférence à des températures de 100°C à 160°C, de manière tout particulièrement préférée à des températures de 110°C à 140°C.
EP99906236A 1998-02-18 1999-02-13 Procede pour produire en continu, sans solvant ni mastication, des matieres autocollantes, a base d'elastomeres non thermoplastiques, et leur application pour produire des articles autocollants Expired - Lifetime EP1056584B2 (fr)

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Application Number Priority Date Filing Date Title
DE19806609A DE19806609A1 (de) 1998-02-18 1998-02-18 Verfahren zur kontinuierlichen, lösungsmittel- und mastikationsfreien Herstellung von druckempfindlichen Selbstklebemassen auf Basis von nicht-thermoplastischen Elastomeren sowie deren Beschichtung zur Herstellung von selbstklebenden Artikeln
DE19806609 1998-02-18
PCT/EP1999/000968 WO1999042276A1 (fr) 1998-02-18 1999-02-13 Procede pour produire en continu, sans solvant ni mastication, des matieres autocollantes, a base d'elastomeres non thermoplastiques, et leur application pour produire des articles autocollants

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EP1056584B1 (fr) 2002-05-22
US6780271B1 (en) 2004-08-24
EP1056584A1 (fr) 2000-12-06
ES2175946T3 (es) 2002-11-16
ES2175946T5 (es) 2011-05-05
DE19806609A1 (de) 1999-08-19
DE59901494D1 (de) 2002-06-27
JP2002503567A (ja) 2002-02-05
JP4399111B2 (ja) 2010-01-13
WO1999042276A1 (fr) 1999-08-26

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